How to unit test a chained method using Jasmine

Question

I\'m having a problem unit testing the following method:

 $scope.changeLocation = function (url) {
        $location.path(url).search({ ref: \"outline\" });
         


        

Answer 1

That is because your mock does not return location object to be able to chain through. Using Jasmine 2.0 you can change your mock to:

var $locationMock = { path: function () { return $locationMock; }, 
                      search: function () { return $locationMock; } };

and

spyOn($locationMock, "path").and.callThrough();
spyOn($locationMock, "search").and.callThrough(); //if you are chaining from search

or add:

spyOn($locationMock, "path").and.returnValue($locationMock);
spyOn($locationMock, "search").and.returnValue($locationMock); //if you are chaining from search

Or just create a spy object (less code):

var $locationMock = jasmine.createSpyObj('locationMock', ['path', 'search']);

and

$locationMock.path.and.returnValue($locationMock);
$locationMock.search.and.returnValue($locationMock); //if you are chaining from search